[jboss-user] [JBoss Seam] - New to seam: How to choose proper context and achieve extern
Hi!
Here is what I am trying to do:
1. I need a page that loads its dataTable contents from db fresh every time I access the
page.
2. The items in the dataTable need to be clickable and bookmarkable in the future; this is
why s:link was chosen. According to my experience, @Scope(PAGE) does not cut it with
<s:link> elements, as the parameters are passed on as null.
3. My business items allow clicking a link, but instead of directly linking the user to
the external url I want to record the click-count first. So intuitively I thought I could
just return the url from the click-counting action.
The solutions I have tried are the following:
1. Page scope seems to have the right idea: the dataTable contents are refreshed from db
each time the page is refreshed. However, page context seem to have problems with
requirement 2 -- or am I doing something else wrong?
2. If I use Session scope, the <s:link> works fine and passes the actual objects as
parameters to the desired method recordLinkClickAndRedirect(). However, with Session scope
the dataTable does not get fresh data in a new page-refresh, because the session is still
alive. I can actually make this happen by binding the @Destroy and @Remove annotations to
my recordLinkClickAndRedirect() method, but it seams like a hack and I would rather not do
that if there is a better way.
3. I have not found a way to redirect from within my recordLinkClickAndRedirect() method,
but intuitively it seems like there should be a way as this is how navigation can normally
be affected.
Here are my code snipplets:
::: from items.xhtml
<!-- content -->
<ui:define name="content">
<h1>Latest business items</h1>
<h:outputText value="No items found on this round. Please refresh page to check
again!"
rendered="#{businessItems == null or businessItems.rowCount==0}" />
<h:dataTable var="businessItem" value="#{businessItems}"
rendered="#{businessItems.rowCount>0}">
<h:column>
#{businessItem.description}
<s:link value="#{businessItem.externalLinkURL}"
action="#{itemViewer.recordLinkClickAndRedirect(businessItem)}" />
</h:column>
</h:dataTable>
</ui:define>
::: from ItemViewer.java
@Stateless
@Scope(ScopeType.PAGE)
@Name("itemViewer")
public class ItemViewer implements LocalInterface {
@PersistenceContext
private EntityManager entityManager;
@DataModel
@SuppressWarnings("unused")
private List businessItems;
/**
* This method TODO
*
*/
@Factory("businessItems")
@SuppressWarnings("unchecked")
public void getFreshBusinessItems() {
businessItems = (List) entityManager
.createQuery("select b from businessItem b");
}
/**
* This method records that the link has been clicked and redirects the
* browser to the specific link.
*
* @param businessItem
* @return
*/
public String recordLinkClickAndRedirect(BusinessItem businessItem) {
businessItem.incrementClicks();
return businessItem.getExternalLinkURL();
}
/**
* This method is required by some scopes, e.g., Session scope.
*/
// @Destroy
// @Remove
public void destroyAndRemove() {
// n.a.
}
}
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